Image forming apparatus

a technology of image forming apparatus and forming plate, which is applied in the direction of digitally marking record carriers, visual presentation using printers, instruments, etc., can solve the problems of inability to read patches, optimum transfer current values, and difficulty in making adjustments

Inactive Publication Date: 2010-06-10
KONICA MINOLTA BUSINESS TECH INC
View PDF18 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention relates to an image forming apparatus that can detect and adjust for offsets in the position of a recording sheet as it is conveyed. This is achieved by forming a patch at a non-transfer area where no image is to be transferred, and controlling the image forming condition based on the patch read by a sensor. The control section can perform a first control based on the offset of the recording sheet when the sub scanning direction image area signal is active for image forming, and a second control when the patch area signal is active. The technical effect of this invention is to improve image quality and accuracy by automatically compensating for offsets in the recording sheet position."

Problems solved by technology

However, it is difficult to make adjustments to ensure the optimum transfer current value.
This leads to the inability of reading a patch.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Image forming apparatus
  • Image forming apparatus
  • Image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

second embodiment

[0071]The following describes the operation of the image forming apparatus of the second embodiment.

[0072]In the second embodiment as well, similarly to the case of the first embodiment, the control section 101 performs the offset regulation control to regulate the main scanning direction image area signal, when the offset sensors 160s1 has detected the offset of the recording sheet in the main scanning direction conveyed by the conveyance section 160. In this case, having received the instruction of executing the offset regulation control from the control section 101, the main scanning direction image area signal generation section 112 accepts the index signal, pixel clock and offset detection result, and generates the main scanning direction image area signal H-Valid in conformity to the offset during the conveyance of the recording sheet. In FIG. 5, the portion wherein the H-Valid is active is indicated by hatching. This ensures an image is formed (transferred) on the recording s...

third embodiment

[0081]The following describes the operation of the image forming apparatus of the third embodiment.

[0082]In the third embodiment, the sub-scanning direction image area signal generation section 111 includes the sub-scanning direction image area signal generation section 111a for generating the regular sub-scanning direction image area signal V-Valid, and the sub-scanning direction image area signal generation section 111b for a patch that generates the sub-scanning direction image area signal V-Valid′ for a patch, as before, as shown in the block diagram of FIG. 6. The sub-scanning direction image area signal generation section 111 of FIG. 1 can incorporate a similar structure.

[0083]In the third embodiment as well, similarly to the case of the first and second embodiments, the control section 101 performs the offset regulation control to regulate the main scanning direction image area signal, when the offset sensor 160s1 has detected the offset of the recording sheet in the main sca...

embodiment 4

[0092]In the aforementioned third embodiment, only one type of the sub-scanning direction image area signal V-Valid′ for a patch was shown. In the presence of a plurality of patches such as a density patch, registration patch and toner band, density control or registration control can be performed in such a way that the sub-scanning direction image area signals V-Valid′ (V-Valid′, Valid″, . . . ) for patches are prepared to conform to these patches, and the patches are formed according to these signals, respectively, without being affected by offset regulation control (or offset regulation control using a fixed value).

[0093]The aforementioned procedure can be performed when the sub-scanning direction image area signals V-Valid′ for various forms of patches are overlapped. Even if overlap occurs in the sub-scanning direction, no problem arises since patches formed in the non-transfer area are positioned differently in the main scanning direction.

[0094]According to the present embodim...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An image forming apparatus including a control section which detects an offset of a recording sheet being conveyed, the offset being in a main scanning direction perpendicular to a conveyance direction of the recording sheet; performs an offset regulation control which adjusts a main scanning direction image area signal in accordance with the offset; and forms a patch at a non-transfer area on an image carrier, wherein the control section performs a first control based on the offset of the recording sheet for the offset regulation control while a sub scanning direction image area signal is active for image forming on the recording sheet, and performs a second control for the offset regulation control while the image area signal in the sub scanning direction is inactive.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on Japanese Patent Application No. 2008-314266 filed on Dec. 10, 2008 at the Japanese Patent Office, the entire content of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of Technology[0003]The present invention relates to an image forming apparatus such as a photocopier and printer, particularly to an image forming apparatus that uses a sensor to detect the patch density formed on a recording sheet and to control the image forming conditions, and provides offset regulation control of shifting an image formation area in response to the offset during conveyance of the recording sheet.[0004]2. Description of Related Art[0005]One of the conventional apparatuses includes an image forming apparatus that forms an image by the steps of:[0006]forming an electrostatic latent image on an image carrier in conformity to image data;[0007]generating a developed image (toner image) by developi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(United States)
IPC IPC(8): G06K15/02
CPCB41J11/008G03G2215/00059G03G15/5058G03G15/0131H04N1/04
InventorTAKAKI, KOUICHI
OwnerKONICA MINOLTA BUSINESS TECH INC